PIC17C752-08/CL MICROCHIP [Microchip Technology], PIC17C752-08/CL Datasheet - Page 163

• Manufacturer Part Number: PIC17C752-08/CL
• Description: High-Performance 8-Bit CMOS EPROM Microcontrollers with 10-bit A/D
• Manufacturer: MICROCHIP [Microchip Technology]

15.2.13 ACKNOWLEDGE SEQUENCE TIMING
An acknowledge sequence is enabled by setting the
acknowledge
(SSPCON2<4>). When this bit is set, the SCL pin is
pulled low and the contents of the acknowledge data
bit is presented on the SDA pin. If the user wishes to
generate an acknowledge, then the ACKDT bit should
be cleared. If not, the user should set the ACKDT bit
before starting an acknowledge sequence. The baud
rate generator then counts for one rollover period
(T
When the SCL pin is sampled high (clock arbitration),
the baud rate generator counts for T
is then pulled low. Following this, the ACKEN bit is
automatically cleared, the baud
turned off, and the SSP module then goes into IDLE
mode.
FIGURE 15-32: ACKNOWLEDGE SEQUENCE WAVEFORM
BRG
1998 Microchip Technology Inc.
), and the SCL pin is de-asserted (pulled high).
(Figure
15-32)
SSPIF
sequence
Acknowledge sequence starts here,
SDA
SCL
Note: T
Set SSPIF at the end
of receive
BRG
= one baud rate generator period.
ACKEN = 1, ACKDT = 0
enable
Write to SSPCON2
BRG
rate generator is
bit,
. The SCL pin
8
D0
ACKEN
Cleared in
software
T
BRG
ACK
15.2.13.1 WCOL STATUS FLAG
If the user writes the SSPBUF when an acknowledege
sequence is in progress, then WCOL is set and the
contents of the buffer are unchanged (the write doesn’t
occur).
T
9
BRG
Set SSPIF at the end
of acknowledge sequence
ACKEN automatically cleared
Cleared in
software
PIC17C7XX
DS30289A-page 163